rpm database broken

[Francois Massonneau <frmas free fr>]

Hi,
I guess my rpm database is broken ;-(
I can't rebuild it, whatever I try :
rpmdb --rebuilddb
rpm --rebuilddb

Now I have hundred of lines like those ones and it finishes with a 
segmentation fault.

error: rpmdbNextIterator: skipping h#     423 blob size(3368): BAD, 8 + 16 * 
il(17) + dl(3056)
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
etc..../.
error: rpmdbNextIterator: skipping h#     957 Header V3 DSA signature: BAD, 
key ID 66534c2b
error: rpmdbNextIterator: skipping h#     957 Header V3 DSA signature: BAD, 
key ID 66534c2b
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
error: rpmdbNextIterator: skipping h#     956 Header V3 DSA signature: BAD, 
key ID db42a60e
Erreur de segmentation
[root celtes2 archives]#

Does someone can give me a way to rebuild it ?
Thanks. Francois